Via the app, users can keep track of their phone's mobile data usage, getting alerts when the usage gets to a certain point. Users can even split the data usage for individual apps, which a pretty good to for determining whether any apps are leaking data.

All of these things, of course, are done in the effort to save you money. So its a big help that My Data Manager comes in a ad-supported free version. There is also a pro version of the app, which costs $4.

Of course, this isn't the first app if its kind. Perennial favorite 3G WatchDog plays pretty much the same role. But it's always nice to have options.